1. LLRF and Beam-based Longitudinal Feedback Readiness
Outline
Overview of the system
December 2006 readiness requirements
Dependencies
Activities to get there – past/present/future
Conclusion

2. Overview of the system
The low level RF controls system consists of RF phase and amplitude controls at these locations:
Laser
Gun (Klystron 20-6)
L0-A, a.k.a. L0-1 (Klystron 20-7)
L0-B, a.k.a. L0-2 (Klystron 20-8)
L0 Transverse cavity (Klystron 20-5)
L1-S (Klystron 21-1)
L1-X (Klystron 21-2)
L2 - (Klystrons 24-1,24-2,24-3) to control avg phase/ampl of L2
L3 Transverse cavity (Klystron 24-8)
L3 - 2 sectors of klystrons, S29+S30
The feedback system consists of a VME chassis connected to LLRF IOCs via private ethernet

4. Dec 2006 readiness requirements
RF phase and amplitude controls at these locations:
Laser
Gun (Klystron 20-6)
L0-A, a.k.a. L0-1 (Klystron 20-7)
L0-B, a.k.a. L0-2 (Klystron 20-8)
L0 Transverse cavity (Klystron 20-5)
L1-S (Klystron 21-1)
Longitudinal beam-based feedback controls as far as BC1

5. Dependencies
Use of current downtime to proceed with installation at LINAC Sector 0
RF hut readiness with racks, AC power, cables and water by July2006 (downtime)

6. Activities to get there past/present/future
Five categories of hardware
Low level RF chassis (in-house)
Monitor chassis (in-house with COTS timing)
Fast control chassis (in-house with COTS timing)
Slow control chassis (in-house)
Feedback control chassis (COTS products)

7. Low level RF chassis (in-house)
What for? Low level RF distribution where EPICS is not required
Where? LINAC Sector 0, the RF hut and klystron stations
Status now: 119, 476, 2856, MHz – 16 way distributions complete
Steps to complete:
by Oct2005: PEP-II master phase shifter
by Nov2005: IQPAU
by Nov2005: 476 MHz master amplifier
by Jan2006: LO chassis

8. RF Distribution

9. PEP-II master phase shifter
476 MHz master amplifier
PEP-II master phase shifter

10. LLRF Phase Reference System
to 2856MHz Divide by 16 Chassis

11. LLRF Phase Reference System
119 to 476MHz Divide by 16 Chassis

13. Monitor chassis (in-house with COTS timing)
What for? Local RF phase/amplitude monitoring
Where? Laser, gun, L0-A, L0-B, L1-S
Status now: Evaluating ADCs
Steps to complete:
by Dec2005: evaluation of ADCs (1chan)
by Mar2006: board prototype (4 chan, thermo)
by May2006: final board
by Sep2006: chassis (15 dual channel)
by Oct2006: injector install

14. Fast control chassis (in-house with COTS timing)
What for? Local RF phase/amplitude control
Where? Laser, gun, L0-A, L0-B, L1-S
Status now: board design
Steps to complete:
by Jan2006: board prototype
by Mar2006: final board
by Sep2006: chassis (6 single channel)
by end of 2006 downtime: injector install

15. Slow control chassis (in-house)
What for? Phase and amplitude control of the reference
Where? Sector 20 RF hut
Status now: not started
Steps to complete:
by Feb2006: start design
by Mar2006: board prototype
by May2006: final board
by Sep2006: chassis (6 single channel)
by Nov2006: injector install

16. RF crate What for? Local feedback control and timing for RF systems
Where? Sector 20 RF hut
Status now: testing EVR
Steps to complete:
evaluate number of signals and processor load to determine number of crates
design and write software
test with simulation and later hardware
during 2006 downtime: install

17. Feedback control crate (COTS products)
What for? beam-based longitudinal feedback
Where? At sector 20, in RF hut
Status now: software design
Steps to complete:
purchase network switch module if IOC has insufficient ports
by Dec2006: software
by Dec2006: installation

18. Conclusion
The low level RF system and the global feedback system will be ready for commissioning by December 2006, based on the plan presented.